Sofa



FIG. 1 is a front, right perspective-view of a sofa;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left-side view thereof, the right-side view being a mirror image of the left-side view; and,

FIG. 5 is a top view thereof. 

CLAIM The ornamental design of a sofa, as shown and described. 